Tru64: Use full-path include directives in Makefiles (#10569)

Tru64's make(1) resolves relative paths in "include" directives with
respect to the includer.  This is inconsistent with all other known make
tools.  Note that this make tool treats the path literally so we cannot
use our standard FULL path code which escapes spaces.  Instead qualify
the paths with $(CMAKE_BINARY_DIR) to avoid the problem.

Modules/Platform/OSF1.cmake

@@ -25,6 +25,7 @@ IF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
   SET(CMAKE_SHARED_LIBRARY_RUNTIME_C_FLAG_SEP ":")
 ENDIF(CMAKE_SYSTEM MATCHES "OSF1-V.*")
 
+SET(CMAKE_MAKE_INCLUDE_FROM_ROOT 1) # include $(CMAKE_BINARY_DIR)/...
 
 IF(CMAKE_COMPILER_IS_GNUCXX)
   # include the gcc flags 

Source/cmDocumentVariables.cxx

@@ -1398,4 +1398,6 @@ void cmDocumentVariables::DefineVariables(cmake* cm)
                      cmProperty::VARIABLE,0,0);
   cm->DefineProperty("CMAKE_LINK_DEPENDENT_LIBRARY_DIRS",
                      cmProperty::VARIABLE,0,0);
+  cm->DefineProperty("CMAKE_MAKE_INCLUDE_FROM_ROOT",
+                     cmProperty::VARIABLE,0,0);
 }

Source/cmMakefileTargetGenerator.cxx

@@ -189,12 +189,15 @@ void cmMakefileTargetGenerator::WriteTargetBuildRules()
 //----------------------------------------------------------------------------
 void cmMakefileTargetGenerator::WriteCommonCodeRules()
 {
+  const char* root = (this->Makefile->IsOn("CMAKE_MAKE_INCLUDE_FROM_ROOT")?
+                      "$(CMAKE_BINARY_DIR)/" : "");
+
   // Include the dependencies for the target.
   std::string dependFileNameFull = this->TargetBuildDirectoryFull;
   dependFileNameFull += "/depend.make";
   *this->BuildFileStream
     << "# Include any dependencies generated for this target.\n"
-    << this->LocalGenerator->IncludeDirective << " "
+    << this->LocalGenerator->IncludeDirective << " " << root
     << this->Convert(dependFileNameFull.c_str(),
                      cmLocalGenerator::HOME_OUTPUT,
                      cmLocalGenerator::MAKEFILE)
@@ -205,7 +208,7 @@ void cmMakefileTargetGenerator::WriteCommonCodeRules()
     // Include the progress variables for the target.
     *this->BuildFileStream
       << "# Include the progress variables for this target.\n"
-      << this->LocalGenerator->IncludeDirective << " "
+      << this->LocalGenerator->IncludeDirective << " " << root
       << this->Convert(this->ProgressFileNameFull.c_str(),
                        cmLocalGenerator::HOME_OUTPUT,
                        cmLocalGenerator::MAKEFILE)
@@ -238,7 +241,7 @@ void cmMakefileTargetGenerator::WriteCommonCodeRules()
   // Include the flags for the target.
   *this->BuildFileStream
     << "# Include the compile flags for this target's objects.\n"
-    << this->LocalGenerator->IncludeDirective << " "
+    << this->LocalGenerator->IncludeDirective << " " << root
     << this->Convert(this->FlagFileNameFull.c_str(),
                                      cmLocalGenerator::HOME_OUTPUT,
                                      cmLocalGenerator::MAKEFILE)